2 factorial = 2! = 2 x 1 = 2
3 factorial = 3! = 3 x 2 x 1 = 6
4 factorial = 4! = 4 x 3 x 2 x 1 = 24

10 factorial = 10! = 10 x 9 x 8 x .... x 3 x 2 x 1 = 3,628,800

ADDITION

SUBTRACTION

MULTIPLICATION

DIVISION

2! + 3! = (2 x 1) + (3 x 2 x 1) = (2) + (6) = 8

4! - 2! = (4 x 3 x 2 x 1) - (2 x 1) = (24) - (2) = 22

2! x 3! = (2 x 1) x (3 x 2 x 1) = (2) x (6) = 12

5! / 3! = (5 x 4 x 3 x 2 x 1) / (3 x 2 x 1) = (120) / (6) = 20